Jellyfin Subdomain: Apache Reverse Proxy and MPM

My Apache Virtual Host with Reverse Proxy allow me to access my Jellyfin server using subdomain:

<VirtualHost *:443>
	ServerName	jellyfin.my-domain.net

	ProxyPreserveHost	On
	ProxyPass		"/embywebsocket"	"ws://127.0.0.1:8096/embywebsocket"
	ProxyPassReverse	"/embywebsocket"	"ws://127.0.0.1:8096/embywebsocket"
	ProxyPass		"/"			"http://127.0.0.1:8096/"
	ProxyPassReverse	"/"			"http://127.0.0.1:8096/"

	SSLEngine	on
	SSLCertificateFile	/etc/letsencrypt/live/my-domain.net/fullchain.pem
	SSLCertificateKeyFile	/etc/letsencrypt/live/my-domain.net/privkey.pem
	Include	/etc/letsencrypt/options-ssl-apache.conf
	Protocols h2 http/1.1

	ErrorLog	/var/log/apache2/jellyfin-error.log
	CustomLog	/var/log/apache2/jellyfin-access.log	combined
</VirtualHost>

But…
All things worked until changing Apache MPM module from Prefork to Event.
I cannot access Jellyfin page with browser now.
I have checked, that switching back to Prefork module restore the access to the page.
Enabled Apache modules: cgid proxy proxy_fcgi.
I have very few expirience with Apache, especially with Proxy, and especialy with FastCGI and PHP-FPM.
I have checked also:

	ProxyPreserveHost	On
	ProxyPass		"/embywebsocket"	"ws://127.0.0.1:8096/embywebsocket"
	ProxyPassReverse	"/embywebsocket"	"ws://127.0.0.1:8096/embywebsocket"
#	ProxyPass		"/"			"http://127.0.0.1:8096/"
#	ProxyPassReverse	"/"			"http://127.0.0.1:8096/"
	ProxyPass		"/"			"fcgi://127.0.0.1:8096/"
	ProxyPassReverse	"/"			"fcgi://127.0.0.1:8096/"

with no success (503 Service Unavailble).

Does anybody have an experience with using Apache Proxy + Event MPM?
There is very few information about it, and the most frequent answer is: “Use Nginx in place of Apache”…